Improvement in mortising-tool



Stam? THOMAS BURDICK AND JAMES H. BURDICIQ-'Ol ALBANY, NEW

YORK.

Lette/rs Patent No. 86,209, dated J'amuwy 26, 1869.

IIVEPRO'V'EMENT IN MORTISING-TQOL.

The Schedule referred to in these Letters Patent and making part of ther same.

To all whom it ma/g/ cmwerm Be it known that we, THoMAs BURDIGK and JAME's H. BURDICK, of Albany, in the county of Albany, an'd State of New York, have invented a new and improved Mortising-Machine; and we do hereby declare that the following is a full, clear, and exact description thereof,

,which will enable others skilled in the artto make and The object of this invention is to produce an iinproved construction and arrangement of a reversible cutter for a mortising-machine, whereby it is rendered capable of enduring a much greater strain and is also more reliable in operation than those heretofore known; and

The invention consists in providing the cutting-tool or chisel with a shoulder or projection, and in the arrangement of the same with reference to contiguous parts, as hereinafter described.

A, in the drawings, represents a plate or holder, of suitable form, size, and arrangement, applied to any kind of machine, whether the same is driven by steam or muscular power. It is connected with suitable mechanism, so that it may receive reciprocating motion.

To the face of the plate A is pivoted, by means of a pin, a, a pcinted-cutting-tool, B, the cutting-edge b of which projects below the plate A, as shown.

The upper portion of the tool B is ont away so as to'form a shoulder, c, at the point of junction of the said tool and the lower cross-bar l1, by which construction thelatter is made to 4receive the successive shocks incident to the operation of the machine, and the strain thereby almost wholly removed from the pivot which secures the tool B to the reciprocating plate.

The tool is pointed to an angle of about twelve degrees, and-can be swung around its pivot the same number of degrees, so that, when swung to one side, its face c is vertical, as shown by black lines in fig. 1, or rather parallel with the line of motion of A, While, when swung to the other side, its face d is in the same aforesaid direction, as shown by redlines by iig. 1.

The tool works with its upper, non-cutting part between ribs e e, that project from the plate A, and, by the distance which they stand apart, is regulated the motion of the tool. The ribsor cheeks e e are connected by horizontal bars b 77. One of the advantages of this construction, additional to that before alluded to, is that of steadying the cutter in its operation.

By means of a wedge, f, or by a spring, pin, or other equivalent device, will the tool' be locked in the desired j 

